Don't Panic: The Official Hitchhiker's Guide to the Galaxy Companion is a book by Neil Gaiman about Douglas Adams and The Hitchhiker's Guide to the Galaxy. The book was originally published in 1986 in the United States and United Kingdom (ISBN 1-85286-013-8) by Titan Books. A second edition, retitled Don't Panic: Douglas Adams & The Hitch Hiker's Guide to the Galaxy was published in the United Kingdom in July 1993, containing additional material by David K. Dickson (ISBN 1-85286-411-7). A third edition, with another slight title revision (now known as Don't Panic: Douglas Adams & The Hitchhiker's Guide to the Galaxy) was published in the UK by Titan Books in June 2002, and contains further additional material, this time by M. J. Simpson (ISBN 1-84023-501-2). An updated edition was published by Titan Books in October 2003 (ISBN 1-84023-742-2). A further edition was published by Titan Books in September 2009 (ISBN 9781848564961). Source: Wikipedia (en)